linux-kernel - Re: [PATCH] shm: optimize exit

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Date:	Wed, 3 Aug 2011 21:21:38 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Vasiliy Kulikov <segoon@...nwall.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Manuel Lauss <manuel.lauss@...glemail.com>,
	Richard Weinberger <richard@....at>,
	Marc Zyngier <marc.zyngier@....com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] shm: optimize exit_shm()

On 08/03, Vasiliy Kulikov wrote:
>
> As .in_use may be changed to zero while current
> process was sleeping in down_write(),

Yes,

> we should check .in_use once again after
> down_write().

Why?

It doesn't hurt to recheck and I think the patch is correct.
But the changelog looks confusing.

Oleg.

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